Pump jack



June 21,1927 1,633,045 "I", J.ISTEBBINS PUMP JACK Filed Oct. 19, 1925 2 $heet-Sheet 1- 1,633,045 JP 2 T, J. srEBBIN'S PUMP JACK Filed Oct. 19, 1925 2 Sheets-Sheet 2 Patented June 21, 1927.

UNITED STATES TIMOTHY J. STEBBINS, OF DAVENPORT, IOWA,'ASSIG1\TOR T0 RED JACKET MANUFAC-i 1,633,045 PATENT OFFICE.

TUBING CO., OF DAVENPORT, IOWA, A CORPORATION OF IOWA.

PUMP JACK.

Application filed October 19, 1925. Serial No. 63,204.

-This invention relates to improvements in power heads, or pump j acks', of the type primarily employed for transmitting rotary driving motion of a prime mover into oscillatory motion, for driving reciprocably op erating pumps.

The object of the invention is to produce an improved construction of devices of the class described, which is especially simple and durable, economical in construction, and which is practically self lubricating so as to require a minimum amount of attention or repair.

The invention may best be understood by reference to the accompanying drawings, illustrating one form in which it mav be embodied. In the drawings, Fig. 1 is a side view of the device, with parts broken away to show portions of the interior thereof.

Figure 2 is a top plan view of the device shown in Fig. 1.

Fig. 3 is an end view of the same device, with a part shown in section.

Referring now to details of constrltlction shown in the drawings, a casing 10 is made up of two side pieces 11 and 12: fitted to gether along cooperating flanges 11 and 12 and suitably secured as by bolts 13, 13 to make the casing substantially oil tight, where joined. The casing forms a housing for an enclosed gear 15 fixed onshaft 16 having bearing at opposite ends in side pieces 11 and 12, said casing being substantially cylindric to conform with the outline of said gear, excepting at the bottom, where it is provided with projecting legs or supports 17, 17, and at the top where a drive shaft 18 passes through an extended portion 19' of said casing, and also a second shaft 20 passes through an extended portion 21 of said casing; The purpose of these extended portions 19 and 21 will hereinafter more fully appear.

The operating parts of the device comprise a pinion 23 on drive shaft 18, meshed with gear 15. A crank arm 25 is keyed on the end of the shaft 16 projecting beyond the outside of the side piece 11, so that said gear and crank arm rotate together. A pin 26 is carried on the end of arm 25, and has a link member 27 pivotally connected thereto. This link member, as best shown in Figs. 1 and 3, has a cup-shaped annular portion 28, having its point of pivotal connection with pin 26 at the center thereof, and

its peripheral flange portion 29 turned inwardly to close relationship with side piece 11, and of suliicient diameter to cover the exposed end of shaft 16 and the .crank arm 25 in all. positions of rotation thereof. The link member 27 is also provided with a pivotal connection 30, eccentric of the annular portion 28, as herein shown, said connection being carried on a projection 31, at one side of said annular member 28 and connected with arms 34 of an actuating member 35. Said actuating member comprises a pair of arms 36, 37, arranged at opposite sides of the casing and projecting forwardly therefrom, said arms being keyed or otherwise secured to the shaft 20 so as to be rocked in unison by operation of the link 34 which in the form'shown is integral with the arm 36. It will be seen in Fig. 1 that the arms 36 and 3'? are arranged atan angle to the connected arm 34, and that the arms 36 and 37 extending generally in a forward direction, where they are adapted to be pivotally connected at their outer ends to pitmen of the usual type arranged at opposite sidesof a reciprocal pump. The pump and pitmen are not shown, as they form no part" of the present invention.

' The arms 36. and 37 are provided with a series of holes 38 for adjusting the length .of the lever arm when connected to the pit men.

From the above description it will be seen that the driving shaft 18 may be rotated in any suitable manner, as, for instance, by a prime mover connected with a belt 40 and pulley 41, and impart an oscillatory movement to the actuator 35 through the medium of pinion 23, gear 15', crank arm 25 and link member 27, this oscillatory movement being at a reduced speed depending. upon the ratio of the gear. the actuator is effective for operating the pitmen connected to the arms 36 and 37 ofsaid actuator, as above described.

One of the principal advantages of the construction above descrbed isthe arrangement of the casing obtained in such a manner as to be substantially oil tight, but with a. suitable orifice 42 for introduction of lu- The' oscillatory n'iovement of.

bricated, the projections 19 and at the upper part of the casing being such as to permit ready access of lubricant from the the casing to said shafts and their respective bearings formed integral with the side pieces '11 and 12, as shown. 7 i

It will be observed that the peculiar shape of the link member 27 affords protection for the crank and furthermore, lubricant will find its way through the bearing for shaft 16 adjacent the crank arm 25 in sufficient quantities to lubricate the pivotal connection of link member 27 on pin 26. i

A further advantage of the construction described is the arrangement of the-crank arm 25, link 27 and L-shaped actuator so as to be freely movable on the outside of the casing. Owing to this arrangement, it, will be seen that the position of the actuator 35 may be readily changed from that shown in the drawings in which it extends substantially parallel with thebase for operating the vertical pump, to a position substantially at 90 degrees therefrom in which the actuator arm 36 may be arranged for operat: ing the horizontal pump with the pitman extending substantially parallel with the base. This change may be made without dismounting or changing the actuator arm, by simply removing the connecting pin 50 between arm 34 and link 27, swinging the adjacent ends of this arm and. link upwardly, and reconnecting them in the new position. r The entire structure is particularly simple and lends itself to economy in manufacture as well as having all, its parts readily accessible for inspection and repair.

Althoughl have shown and described one form of my invention, it will be understood that I do'not wish to be limited to the exact construction shown and described, but that various changes and modifications may be made without departing from the spirit and scope of my invention. i

I claim as my invention:

1,111 a power head, an enclosed casing forming a luhricant-chamber, reduction gearing in said casing, including driving and driven shafts extending through said casing and having bearings therein, said driven shaft having a crank arm carried thereon outside of said casing, an oscillating actuator comprising a shaft extending through said lubr cant-chamber and having hearing in said casing, and a pair of arms at opposite ends of said shaft adapted for attachment to pitmen, an arm disposed sub stantially at a right angle to said first named arms, and a link connecting said last named arm with said cran k arm.

2. In a power head, a casing, gearing in i for attachment to pitm'en, and a link connecting said actuator with said crank arm, said link having flanged means carried thereby turned inwardly 1 toward the adjacent sideof said casing and enclosing said pair of" arms at opposite ends of said shaft adapted crank arm in all positions of. rotation thereof.

3. In a power head, an enclosed casing forming a lubricant-chamber, driving and driven shafts extending through and having hearingv in said casing andconnected by intermediate gear reduction mechanism in said casing, an L-shaped oscillating actuaton extending member including a shaftthrou 'h said lubricant-chamber .andhavm t b e I. n I l l D loearin in said casnm and a air of arms at Q 7 D a i opposite ends of said shaft 2. V apted for conncctior. with pitmen, and means disposed on the exterior of said casing and affording operative connection between said actuator and said driven shaft in a plurality of anguar positions of said actuator relative to, said casing.

4. In a power head, a casing, driving and drh en shafts extending through and-having bearing insaid casing and connectedv by interim-idiate gear reduction mechanism in said casing, an oscillating actuator member including a shaft extending through and having bearing in said casing and a pair of arms at opposite ends of said shaft adapted for connection with pitmen, a crank arm on the said driven shaft outside of said casing, and a link having a flanged portion turned inwardly toward the" adjacent side of said casing and enclosing said crank arm in all positions of rotation thereof.

5. In a power head, a casing, reduction gearing in said casing including driving and driven shafts having bearing in said casin a crank arnron the end of said driveirshaf t outside of said casing, an ocillating actuator con'lprising a shaft, a pair of arms on said shaft freely movable at opposite sides of said casing, and an arm disposed substantially at right angles to said first named arms, and a of ()ct.,-1925.

TIMOTHY J. STEBBINS'. 

